424 



SPECIAL HISTOLOGY. 



backwards towards the fasciculus cuneatus and lateralis. In 

 this course, the fibres describe larger or smaller curves. 





Xt 



The latter is the case with those which come out from the 

 posterior part of the olivary nucleus \corpus dentatum], and 

 which go almost directly backwards and outwards through the 

 accessory olivary nucleus (Stilling), and the grey substance, 

 containing large cells, situated on its exterior; the former con- 



Fig. 14G. Transverse section through the medulla oblongata in Man, x 15 diam.: 

 P, pyramids; 0, olivary bodies ; F.l, fasciculus lateralis ; F.c, fasciculi cuncati ; F.g, 

 fasc. yraciles ; H, root of hypoglossal nerve ; V, root of n. vagus; F.a, fissura an- 

 terior ; F.p, fissura posterior in the floor of the fourth ventricle, or rhomboid fossa; 

 K, raphe: a, longitudinal fibres of the raphe; b, central grey layer with transverse 

 fibres; c, expansion of these fibres in the olivary column and body; d, accessory 

 olivary nucleus ; e, hypoglossal nucleus ; f, decussation of the hypoglossal nerve ; g, 

 nucleus of the vagus ; hhh, larger nerve-cells in the restiform bodies ; i, medullary 

 mass in the interior of the olivary body, belonging to the internal transverse fibres ; 

 &, arcuate fibres external to the olivary body ; /, transverse fibres external to the 

 pyramids; m, n, o, grey nuclei in the pyramids and olivary columns. 



